R语言-等待用户输入带有扫描或读取行 [英] R Language - Waiting for user input with scan or readline

问题描述

我试图让用户输入一些查询关键字，在我的脚本中，我使用了scan或readline.我使用R嵌入式脚本编辑器(Windows)进行了尝试，但是当我执行代码时，它将下一行脚本用作标准输入. 这是我的脚本(一部分)

I'm trying to get the user to input a few keywords for a query, and in my script I used either scan or readline. I tried it using the R-embeeded script editor (Windows) but when I execute the code, it uses my next lines of script as the standard input. Here is my (part of) script

keywords <- scan(what=character(), nlines=1)
keywords <- paste(keywords, collapse=",")
keywords

这是从编辑器执行时的输出

And here is the output when executed from the editor

> keywords <- scan(what=character(), nlines=1)
1: keywords <- paste(keywords, collapse=",")
Read 4 items
> keywords
[1] "keywords"        "<-"              "paste(keywords," "collapse=\",\")"

同时使用source()命令时，我尊重了用户输入.

Meanwhile when I use the source() command, I have my user input respected.

那么在从R软件执行代码的同时，有什么方法可以输入一些东西呢?

So is there any way to be able to input some things while executing the code right from the R software?

推荐答案

这就是我使用readLInes的方式:

FUN <- function(x) {

    if (missing(x)) {
        message("Uhh you forgot to eneter x...\nPlease enter it now.")
        x <- readLines(n = 1)
    }
    x
}

FUN()

或者也许是这些东西:

FUN2 <- function() {

    message("How many fruits will you buy")
    x <- readLines(n = 1)

    message("Good you want to buy %s fruits.\n Enter them now.")
    y <- readLines(n = x)
    paste(y, collapse = ", ")
}

FUN2()

编辑:使用Rgui中的方法...

With your approach in Rgui...

FUN3 <- function(n=2) {
    keywords <- scan(what=character(), nlines=n)
    paste(keywords, collapse=",")
}

## > FUN3 <- function(n=2) {
## +     keywords <- scan(what=character(), nlines=n)
## +     paste(keywords, collapse=",")
## + }
## > FUN3()
## 1: apple
## 2: chicken
## Read 2 items
## [1] "apple,chicken"

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